Method of producing textured superconducting oxide bodies by the oxidation/annealing of thin metallic precursors and precursors and superconducting bodies produced by the method

a superconducting oxide and oxidation method technology, applied in the direction of superconductor devices, inorganic chemistry, electrical apparatus, etc., to achieve excellent superconductivity characteristics, reliable and reproducible, and resist cracking

Inactive Publication Date: 2002-10-10
SANDHAGE KENNETH H +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

0024] Thus, the several objects of the invention include: to provide a high temperature superconducting structure that resists cracking and has excellent superconductivity characteristics where the superconducting crystals are crystallographically oriented so that a direction of preferred superconductivity of the crystal is coplanar with the operationally-required direction of supercurrent; to provide such a superconducting structure having minimal misorientation angle between superconducting oxide grains; to provide high temperature superconducting structures of a thickness less than 20 microns and preferably as thin as a few microns; to provide high temperature oxide superconducting structures with oxide grains that possess a long dimension that is larger than at least one-tenth of one or more dimensions of the structure; to provide such a superconducting body in the form of wires, rods, tapes and sheets; and to provide a method for the fabrication of such a superconductor, which method is reliable and reproducible.

Problems solved by technology

Due to normal grain growth, the larger grains, oriented as desired for operational purposes, tend to consume the smaller grains, which are not oriented as desired.

Method used

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  • Method of producing textured superconducting oxide bodies by the oxidation/annealing of thin metallic precursors and precursors and superconducting bodies produced by the method
  • Method of producing textured superconducting oxide bodies by the oxidation/annealing of thin metallic precursors and precursors and superconducting bodies produced by the method
  • Method of producing textured superconducting oxide bodies by the oxidation/annealing of thin metallic precursors and precursors and superconducting bodies produced by the method

Examples

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example 1

[0076] Metallic Y, Ba, Cu and Ag are mechanically alloyed in a high-energy ball mill. The ratio of metal species is Y:Ba:Cu:Ag=1:2:3:X, where X>0. The all-metal powder is packed into a silver tube. The tube is welded shut. The tube is then hydrostatically extruded at 300.degree. C. into a hexagonal cross-section wire. Several of such deformed tubes are repacked into another silver tube. This multifilament tube is then hydrostatically extruded at 300.degree. C. Several of these multifilament tubes may again be repacked into another silver tube and hydrostatically extruded at 300.degree. C. This packing-deforming-repacking-deforming . . . process is repeated until at least one dimension of each filament core is less than 100 microns in thickness, and preferably, less than 10 microns in thickness. The multifilament tube is then heated to 500.degree. C. in an oxygen-bearing atmosphere to completely oxidize the metals. The tube is then heated to 920.degree. C. for 400 hours to form the t...

example 2

[0077] Metallic Y and Ba are mechanically alloyed in a high-energy ball mill. The Y and Ba powder are placed inside a copper tube, which is, in turn, placed inside a silver tube. The thickness of the copper tube and the amount of Y and Ba powder added are such that the ratio of Y:Ba:Cu in the silver tube is 1:2:4. The silver tube is welded shut. The tube is then hydrostatically extruded at 300.degree. C. into a hexagonal cross-section wire. Several of such deformed tubes are re-packed into another silver tube. This multifilament tube is then hydrostatically extruded at 300.degree. C. Several of these multifilament tubes may again be repacked into another silver tube and deformed. This packing-deforming-repacking-deforming . . . process is repeated until at least one dimension of each filament core is less than 100 microns in thickness, and preferably, less than 10 microns in thickness. The multifilament tube is then heated to 400-600.degree. C. in an oxygen-bearing atmosphere to com...

example 3

[0078] An alloy of composition YBa.sub.2Cu.sub.3 is produced by mechanical alloying in a ball mill and then blending in Ag powder. The molar ratio of metal species in the blend is Y:Ba:Cu:Ag=1:2:3:X, where X>0. The all-metal powder is packed into a silver tube. The tube is welded shut. The tube is then hydrostatically-extruded at 300.degree. C. into a hexagonal cross-section wire. Several of such deformed tubes are re-packed into another silver tube. This multifilament tube is then hydrostatically extruded at 300.degree. C. Several of these multifilament tubes are again repacked into another silver tube and hot extruded. This packing-deforming-repacking-deforming . . . process is repeated as described above until at least one dimension of each filament core is less than 100 microns in thickness and preferably, less than 10 microns in thickness. The multifilament tube is then heated to 400-600.degree. C. in an oxygen-rich atmosphere to completely oxidize the metals. The tube is then ...

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Abstract

An elongated superconducting body has a core of superconducting oxide grains, and a constraining nonsuperconducting boundary substantially superscribing the superconducting core. The core has thin dimension that is less than or equal to ten times the average length of the grains and the grains are oriented with their a-b crystallographic planes coplanar with a line extending in the longitudinally-extending direction of the core.

Description

[0001] This invention relates to superconducting materials in general and, in specific, to textured superconducting oxide bodies and a process for making the same from metallic precursors. It also relates to multifilamentary superconducting oxide bodies with enhanced electrical properties.[0002] Superconductors are materials having essentially zero resistance to the flow of electrons at temperatures below a critical temperature, T.sub.c. It is known that certain metal oxides exhibit superconductivity at relatively high temperatures, e.g. above 10 degrees Kelvin. For example, one group of known superconducting metal oxides has the general formula La.sub.2-xM.sub.xCuO.sub.4-y (where M is an alkaline earth element such as Ba, Sr, etc.) Other groups include, but are not limited to:[0003] 1) R.sub.aBa.sub.bCu.sub.cO.sub.y (where R can be one or a combination of Y, Yb, Er, Ho, Eu, Dy, Gd, La, Pr, Sm, Nd, Ca or other rare earth elements and the subscripts a, b, and c are in the ratio 1:2:3...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C01G3/00C04B35/45C22C28/00C22C29/00C22C29/12H01L39/14H01L39/24
CPCC01G3/006Y10T428/12014C01P2002/77C04B35/4504C04B35/4508C04B35/4521C04B35/4525C04B35/6265C04B35/64C04B2235/3215C04B2235/3224C04B2235/3225C04B2235/3291C04B2235/40C04B2235/401C04B2235/407C04B2235/408C04B2235/6021C04B2235/663C04B2235/76C04B2235/765C04B2235/94C22C28/00C22C29/00C22C29/12H01L39/143H01L39/248Y10T29/49002C01P2002/76H10N60/203H10N60/0801
Inventor SANDHAGE, KENNETH H.PODTBURG, ERIC R.
Owner SANDHAGE KENNETH H
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